Boring bar



June 3, 1930. SNYDER 1,761,804

' BORING BAR Filed Oct. 29, 1926 P'at'e 'nfed" June- 3, I930 A UNITED STATES'PATENFT, OFFICE rmi: L. SNYDER, o1? CLEVELAND, OHIO, Assrelvon TO THE WHITE MOTOR COMPANY,

' or CLEVELAND, 01110, A CORPORATION OF OHIO BORING BAR Application filed October 29, 1926. Serial No. 144,984.

This invention relates to boring'bars and particularly to an improved constructlon of the cutting'tool supporting member there for. I 5 One of the objects of the invention is to provide a boring bar having a movable tool supporting member which may be retracted to facilitate the ready removal of the boring bar from the bore, and then returned to the cutting position without altering the predisposed micrometrical adjustment of the cutting tool. r Another object of the invention is to provide a locking mechamsm for the tool supporting member which will assure rigid support and effectuate 'accurate'adjustment.

Another object of the invention is to provide an articulated tool supportingmember adapted to be yieldingly supported while the I tool is retracted from its cutting position and rigidly secured when the tool is in operative adjustment. c

- Otherobjects and advantages more or less ancillary to the foregoing reside in the specific construction and aggroupment of elements peculiar to the structure, as will become apparent from a more complete examination of this specification, in the claims of which there are assembled certain combinations of parts and specific constructions indicative of the scope and spirit of the in-' vent-ion. e

In the'drawingslwhich illustrate 'a pre ferred embodiment of the invention:

vention, apportion of the bar and the tool supporting memberbeing shown in section in the interest ofclearness.

I40 Figure 2 is a similar view illustrating an actuated-position of' the tool supporting member. 7 u I i FigureB-isatOp elevational new of the boring bar illustrated in Figure 1.

'45 Figure 4 is a detail view inperspective il-v lustrating the construction porting member. v

Figure 5 is a detail view in section taken througha; portion of the boring bar upon a plane indicated by the line 55 in Figure 1.

of the tool suptool holder or tool supporting member embodies a steel block 16, preferably prismoidal' in form and recessed, at 17 to receive a cutting tool 18, which may be of any approved cross sectional form, depending on the form of the shank of the tool. At the bottom of the recess 17 and communicating therewith, there is an obliquely disposed drilled and tapped hole 19, which receives a conical ended screw 20, the inner end of which may bemoved into engagement with the end of the cutting tool to facilitate the vertical adjustments thereof Inthe upper portion of the tool block 15, at an angle of 90 degrees to the tool 18, and communicating with the recess 17 there is a second drilled andtapped hole 21, which receives a headless set screw upon a pin 23, the outer ends of which are Figure 1 Visa fragmentary view of the end portion, of a boringbar embodying the insupported in theadjacent walls of the body ofthe bar. Thepin 23, is located near one end of the slot 14, and somewhat below the center ofthe bar so that the tool holder 15,

within the slot 14. Within a channel 24, in the periphery of the bar and at the same end of the slot in which the pin 23, is located, there isahardened steel stop block 25, positively held in position by the abutting walls may, in its oscillated position, be wholly of the channel 24, and by a screw 26. The

stop block 25, slightly overhangs the slot14, and is preferably relatively thin in order to eliminate the possibility of chips or other foreign matter from accumulating between the toollholderand the end of the slot 14,

and thus jeopardizing the of the support or the precision of the vvertical :ad-

V justment; Above the medial, axis of the hor- 29. Upon-advancement or" the-screw 30, the a tool holder 15, will bewedged againstithe' stop block 25,;and' against the side WallQOfpose a clockwise rotation; of the tool thongh, obviously a, reversal of, the, taper would he I 34,withinthe,bar, co-operativelyassociated with an-indenta-tion 35, in :thetoolhlock 16; 45'

ing lo'ar 10, and intermediate the ends of the slot 14, there are aligned apertures Wand 28, provided to retain atpinr29, whichfis r adapted to lock the tool liolder515, in its vop erative position.

The aperture 28, 1s tapped andemloracesf spondingly screw threaded at 30; The tentral portion of the pin 29, is formed with a s conical section 31, terminating in a cylindrr cal shank 32, which is-piloted inQ the ap erture 27. 1 When the tool holder 15, isad justed in itsvertical position the conical portion of the-pin 29. will engage the adja centface 83, of the block 16, which taceis preferably formed With a planedownwardly and obliquely inclined to-theaxis of the pin thecslot 14, thus providingtherigi'dand positive 'securenientot the tool holder. It

will he. noted that the position of the cone. .31 andthentapered tacef33,.of the block-are. arrangedto oppose the resistance of the cut-s ting. tool during the boring operation. In

the present case the taper is adapted to opf-g necessary it the boring ,barjwere revolved the opposlte dll'eCtlOIl; I

3 j -When the shoring operation is completed, but before; the, bar withdrawn from the, work, the-tool maybe retracted from itslcuta ting position by'removing the .pinz29, and

then revolving the block 16,) to a position within the slot 14:, as illustrated -in' Figure 2'.

In order to retain thetoolholder in thlS pO-;

sition-there is provided a spring PIQSSGClbill'l The ball 34, is supported in aqrecess." 36, which is so disposed, inrelation to -.the tool holder,- as. to permit its retention duringthe vertical adjustment of thejtool holderi; It'vwi'l'l now beapparent that the articulated tool holder, its appurtenances and'sup-i port will afford the ready removal of the tool I from the borewithout injury thereto, and

thatin duplicate'boring operations theadi jastmentpf the cutting tool may tained notwithstanding the revolution oflthe tool holder;

Although the foregoing description isiiec essarily ofa.detailedcharacter in order that" theinvention may he clearly set, torth,- t is to beunderstood that "the specific terminols ogy is not intended tohe restrictive or confining, and that various rearrangements, of

parts and; modifications of structural detail may he resorted to without departing from claimed.

the scope or spirit of theinventionasherein Having thusdescribed the invention, whatis. claimed and desired to be secured by Let-L V, laboring barhavlng a slot extendlng i longitudinally ethfrethroughi} a tool holderters Patent is a ivotedto the slot-separated portions of the of which the cutter is projected laterally of th 'ehar, and inthe other of which the. cutter ,is telescoped 'between the slot-separated por- *tionertnetar, retaining means to 90- I sition-andlock the holder with the cutterin r ar, a cutting tool projecting from an end efth hold hi Sai'd heldertbei n grotatable-enlts p vot-to two alternative positlons, 1n one its first said position, and aspring lpre'ssedi' ball; {cooperatively associated with; an "in; 3 dentation inv said tool holder to retain the;

holder initssecond said position, r

l 2.1111, aboring bar having aslotextending longitudinally :therethrough, a. tool iholder pivoted'to the slot-separated portions 'otfthe I I i bar, a cutting tool pfrojectingfroman end of 1 the: holder, said holder. being rotatable on its pivot totwo; alternative 'positions in onepot o which the cutter is projected laterally of thieri' t-separa efd. pot

ban'andin, theothc'rvof which the cutter is:

, leS P d-hBt een the; or c tions otthe-barna screw traversing theslot,

"said screwhaving a conical portion adapted to, engage anang a y disp s d r a eo theftool, holder and lock thetool holder in its first :sai'di position anda spring pressed halt fcooperativelyassociated with an indentation a in said.tool holdertojretainsthe holder in it s e,

second said position. I

j 3,.) Ina-boring bar having 'aslot extendingthro'ughthe bar, a stopplate I mounted*inthe peripheryof the barand over; i Q hangingqone end o of the ,slot, a tool holder:

pivoteditoxthe slot-separated portions olfivthef the'bar; a screw" traversing the slot, saidscrew anangi1lar1y disposed. surface? Oiithe. tool holder: and lock the tool hol'derinits first;v V

said position, and a spring pressed ballfco Y .operati'velyassociated with an indentation-in saiditool holder to retain the holder in its second said position.

. t. In a'xhor'ing bar having ia longitudinal slot extending "through: the bar, a stop. plate I mounted: in the periphery of. the hare and overhanging oneendi of the slot, a tool holder it pivoted to the slot-separated 'portions'otthe bar-,ia cutter tool projecting from an' e'nd 'ot the *holder,rsai-d holder: heing rotatahle pivot-:to two alternativepositions, in one of which the tool holder is projected laterally of the bar and against said stop plate, and in the other of which the tool holder is telescoped between the slot-separated portions of the 5 bar, and a screw traversing the slot, said screw having a conical portion adapted toengage an angularly disposed surface of the tool holder and lock the tool holder in its first said position. g a In a boring bar having a longitudinal 7 slot extending therethrough, a tool holder pivoted to the slot-separated portions of the bar, a cutter tool projecting from an end of the holder, said holder being rotatable on its pivotto twoalternative positions, in one of which the tool holder is projected laterally of the bar, and in the other or which the tool holder is telescoped between the slot-separated portions of the bar, stop means atone end or" the slot insaid bar, and means for clamping saidholder against said stop means in its projected position. I

6. In a boring bar having a longitudinal slot extending therethrough, a tool holder pivoted to the slot-separated portions of the bar, a cutter tool pro ecting from an end of the holder, said holder being rotatable on its pivot to two alternative positions, in one of which the tool'holder is projected laterally 3 of the bar, and in the other of which the tool holder is telescoped between the slot-separated portions of the bar, stop means at one end of the'slot in said bar, and a screw traversing the slot in said bar and having a conical portion adapted to engage an angularly disposedsurface of the tool holder to clamp it in said first position against'said stop means.

' In testimony whereof I hereunto afiix my 40 signature this 21st da of October, 1926.

FRXNK L. SNYDER. 

